Draw-gear and buffing apparatus.



J. H.. MQOORMIGK.

DRAW GEAR AND BUFFING APPARATUS.

APPLIGATION FILED MAR.8,1EJ13.

1,127,658. Patented Feb.9, 1915.

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.DBAW-GEAR AND BUFFING APPARATUS.

A'ppfieation aia March s, 1913.

To all whom it may concern Be it known'that I, JOHN H. MCCORMICK, a citizen of the United States, residing at Bexley, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Draw-Gear and ButtingApparatus, of which the following is a specification.

My invention relates to'draw gear and bufiing apparatus and aims particularly to produce a dciice of this charactm. that is eX tremely efiicient and in which there is used a minimum number of parts,

One object of my invention is to produce a draft gear comprisinga plurality of friction members interacting to produce their own wedging action by the use of a spring, which spring is preferably of a nature to be unyielding laterally. This spring, which normally maintains the friction mcml'iers in their release position, may also be provided with friction faces bearing directly upon the friction members, in which case the eiieetoi a casing usually used to envelop the friction members is cotton and at the same time, the casing members proper are dispensed with,

as well as the usual form of wed in devices.

ably, or that they may be combine be desired.

- In order to make the faces active and at the same time to make the release more certain, it is desirable to slightly taper the friction. members to give the required wedging action when they are compressed. Inasmuch as the spring itself replaces the casing, it becomes necessary that the spring itself be somewhat tapered, at least when partially or Wholly compressed. In my preferred construction, I attain the desired taper of the spring by varying the pitch of the various coils making up spring, from each end toward its center and in this ner, when the spring is compressed, the center coil will be of a somewhat reater diam- .I also preferably "form my friction members so that the same may be used i ens units to give various eapaci Specification of Lette1 5 Patent.

aten'ted Feb. 9, 1915.

Serial 2 52.918.

ings, in which similar characters of reference designate corresponding parts, and in which:

Figure 1. is a side elevation of my draft gea shown assembled and removed from the rigging, Fig. 2 is a. central longitudinal section of the structure shown in Fig. 1, Fig. 3 is an end view oi"- the structure shown in 1 and looking from the left or". the drawing, and, Fig. 4 is a section taken on line -$e l of 1, ith the spring reinoyed.

In the drawings,

have shown my draft gear as con'iprisina' a plurality of sectoral members 1 having contacting friction faces 2 and outside faces 3 and 3 tapered down wardly in both directions from a $uhstantially central point 4%. Each friction element is also provided with a projecting lug or shoulder 5 having a tapered wedging face 6. it will be understood that the taper of this face 6 determines the amount of wedging pressure received and it may, therefore, be varied to suit conditions. Encireling the entire assemblage of friction elemens 1, is a coiled spring 7 preferably wound from a rectangular or square bar and gradually increasingin pitch fltlfl its end coils 8 and 9 to central point. The end coils 8 and are designed to coast with the wedging faces 6 to produce the desired wed ging' action and they are, 'tl erefore, desirably cut out as at 10 to substantially conform in taper with the faces In order to make the friction faces 2 more active and also assist in the release of the gear after compression, the contacting faces 2 of each 01 the friction members 1, are also longitudinally tapered as will be apparent by a comparison of Figs. 3 and 4... Inasmuch as the .vedging action is produced bythe end coils 8 and 9, and in order to attain the maximum efiiciency, it is desirable to positively znalce these end coils unyielding laterall Y and 1 therefore, weld the end loops to produce annular end coils 8 and 9 of a cylindrical nature.

I wili describe how my draft gear is assembled spring is used whose use pitch toward a a related. It will Fig. 2, that the fricin section have'their red'surfaces Bgin suhstentiaiiy horizontal position, which gives the appearance of a tapered lower edge 11. This slight inclining of the members 1, makes the ta pered surfaces 3"- of each: member lie in con.- tact with the inner flat surfaces of the coils of the spring 7, the edges of whose-inner surfaces are preferably rounded as at 7" to guard against bindin The other outer tapered surfaces 3 will, therefore, not be in contact with the inner surfaces of the spring, but a pressure upon either end of the assembled gear, will cause a relative movement of the alternately spaced members. whose end lugs 5 are bearing against the cut-out portions 10 of the spring ends. The tapered friction surfaces 2 being in frictional engagement with each other, will cause a wedging between each of the abutting members and. in order to permit movement, the ends of .h member carrying the shoulders 5 must be slightly expanded and since the end coils 8 and 9 of the spring are preferably unyielding, in order. to secure the maximum effect, there will be a slight relative movement between the surfaces 6 and 10. This action will continue untilthe members 1 have moved their full length, in which case the assembled gear will be fully compressed the lower edges 11 appearing in a horizontal position and the surfaces 3 and 3" will taper inwardly in both directions fromthe central point .4. However, both the surfaces 3 and 3 will now be in engagement with the inner friction surfaces of the coils of the spring, since the spring itself will present its inner friction faces in a tapered relation, owing to the gradual increasing of its pitch to a central point when expanded,

it being understood that the spring is now substantially fully compressed. It will, therefore, be apparent that each of the friction members has a wedging pressure throughout its entire length and that, therefore, these pressures must be uniformly distributed throughout the entire gear. It will also be seen that I have provided a comparatively simple structure which attains a. maximum efficiency primarily because of this uniform distribution of pressure and ofadequate friction surface. It will further be apparent that by varying the number of the members 1 and by changing their assembled relation with respect to each other, as for instance, making each two abutting members move in the same direction as opposed to making each abutting member move in opposite directions, as shown, the can pacity of my gear may be varied as desired.

What I claim, is:

1. A draw gear and buffing apparatus comprising a plurality of interacting friction members, and a spring for resisting relative movement of said members, said spring central point, shoulders on said sectors having a wedging bearing on all of said members.

2. A draw gear and bufling apparatus comprisinga plurality of friction members, and a spring for encircling said members and resisting relative movement thereof, said spring ends being unyielding laterally.

3. A draw gear and buffing apparatus comprising a plurality of friction members, and a spring for normally maintaining said members in release position, said spring ends embracing the ends of said members and being unyielding laterally.

4:. A draw gear and bufling apparatus comprising a plurality of longitudinally movable sectors, adjacent sectors being oppositely disposed and in frictional engagement with each other, and a spring pressing adjacent sectors in opposite directions and being in direct wedging engagement therewith. i

5. A draw gear and bulling apparatus comprising a pluralitv of longitudinally movable sectors provided with outer friction faces, adjacent sectors being oppositely disposed and in frictional engagement with each other, and a spring for encircling said sectors, said spring having the inside surfaces of its coils in frictional engagement with said outer friction faces.

6. A draw gear and builing apparatus comprising a plurality of longitudinal scctors )rovidcd with outer friction faces, shoulders on said sectors provided with wedging faces, :u'ljacent sectors being oppo sitely disposed and in frictional engagement with each other, and a spring for encircling said sectors and hcin in direct wcdging engugclncnl with said wcdging tacos. said spring having the inside surfaces of its coils in frictional engagement with said outer friction faces.

7L draw gear and hulling apparatus comprising a plurality of longil'luliuully movable sectors, adjacent sectors being oppositely disposed and in frictional engagement with each other, shoulders on said sectors provided with wcdging faces, and a springencircling said sectors. the end coils of said spring being in engagement with said wcdging faces and being unvielding laterally.

movable sectors, ad acent sectors being oppositely disposed and in frictional engagement with each other, said sectors being further provided with outer friction faces tapered in both directions from a substantially r0 vided with wedging faces, and a spring encircling said scctors, the end coils of said spring being in engagement with said wedg- .tiuutiimmmm n.

ing faces and being unyielding laterally, all

. comprising a plurality of friction members engaging each other frictionally, weclging faces on said members. and a spring for normally maintaining said members in release position, and coacting directly with said wedging faces.

11. A draw gear and butting apparatus comprising a plurality of friction members, wedging faces for said members, and a spring for normally maintaining said members in release position and having friction faces for coaction with said members, said spring also coacting with said wedging faces.

12. A draw gear and buifing apparatus comprising a plurality of friction members having coacting wedging friction faces, said members being also provided with wedging faces, and a spring for normally maintaining said'members in release position and coacting directly with said Wedging faces.

'13. A draw gearand butting apparatus.

comprising a plurality of friction members having wedging friction engagement with each other, wedgin'g shoulders on said members, an a spring for normally maintaining said members in release position and having wedging engagement with said shoulders, said spring also having wedging friction engagement with said members.

14. A. draw gear and. buiiing apparatus comprising a plurality of friction members having wedging friction engagement with each other, wedging shoulders on said members and a spring for normally maintaining said members in release position and having wedging engagement with said shoulders.

15. A draw gear and buffing apparatus comprising a plurality of friction members having friction engagement with each other,

, and a spring for normally maintaining said members in release position and having direct wedging engagement with all of said members.

16. A draw gear and buffing apparatus comp-rising a plurality of friction-members, and a spring for normally maintaining said members in release position, all of said members having friction engagement with each other and with said spring.

17. A draw gear and butting apparatus comprising a plurality of friction members, and a spring for normally maintaining said members in release position, all of said members ha \ing wedging and friction contact with said spring.

18. A draw gear and buiiing apparatus comprising a plurality of friction members, wedging shoulders carried by said members, and a spring for normally maintaining said members in release position, said spring having its end coils unyielding transversely and ha ring a wedging bearing on said shoulders.

'19. A draw gear and buiiing apparatus comprising a plurality of interacting friction members, a spring for normally maintaining said members in release position, and means for causing wedging of said members due to said spring when compressed, said friction members being in contact with the coils of said spring and being tapered in opposite directions from approximately their centers, said spring being correspondingly tapered when under compression.

20. A draw gear and buffing apparatus comprising a. plurality of interacting friction members, a spring for normally maintaining said members in release position,

and means for causing wedging of said members due to said spring when compressed, said friction members being in contact with the coils of 'said spring and being tapered, said spring having adjacent coils of graduaily increasing pitch to correspond to the taper of said members when compressed.

21. A. draw gear and builing apparatus comprising a plurality of interacting friction members. a spring for normally maintaining said members in release position, and means for causing wedging of said members due to said spring when compressed, said t'riction members being in contact with the coils of said spring and being tapered in opposite directions from approximately their centers, said spring bearing against said members at each of its ends and having adjacent coils from a central point gradually increasing in pitch to correspond .to the taper of said members when compressed.

22. A draw gear and bufling apparatus comprising a plurality of friction members having wedging faces, a spring fornormally maintaining said members in release position and being in engagement with the outer frictionfaces of said members, and transversely unyielding end coils carried by said spring for bearing against said wedging faces, said friction faces in engagement with said spring being tapered in opposite directions, the pitch of said spring gradually increasingtoward a central point.

23. draw gear and bufiing apparatus comprising a plurality of tapered friction In testimony whereof I affix my signature rnembe las, a splging I'0r riormully Irmintaind in presence of two' witnesses.

mg sal mem ers 1n re ease posltlon, an 1 means for causing a Wedging of said mem- JOHN MCCORMICK bers due to said spring when compressed, Witnesses:

said spring having adqcent coils of grad- WALTER E. L. BOOK,

ually increasing pitch. A. L. PHELPS. 

